CN212581727U - Integrated vertical high-concentration sulfate wastewater treatment device - Google Patents
Integrated vertical high-concentration sulfate wastewater treatment device Download PDFInfo
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- CN212581727U CN212581727U CN202021363761.0U CN202021363761U CN212581727U CN 212581727 U CN212581727 U CN 212581727U CN 202021363761 U CN202021363761 U CN 202021363761U CN 212581727 U CN212581727 U CN 212581727U
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Abstract
The utility model discloses an integrated vertical high-concentration sulfate wastewater treatment device, which comprises a hydrolysis acidification reaction section, a hydrogen sulfide stripping section, a methane production reaction section and a tank body, wherein the hydrolysis acidification reaction section is arranged on the lower section of the tank body and comprises a bottom water distribution pipe for uniformly dispersing high-concentration sulfate wastewater and a first packing layer for providing a growth environment for sulfate reducing bacteria; the utility model discloses will the utility model discloses divide into hydrolytic acidification reaction section and methanogenesis reaction section with anaerobic reaction to add between two sections and establish hydrogen sulfide and blow off the section, weakened the hydrogen sulfide and can cause the inhibitory action to methanogenesis fungus, guaranteed the activity of methanogenesis fungus, improved the treatment effect to high concentration sulfate waste water.
Description
Technical Field
The utility model relates to a waste water treatment field, concretely relates to vertical high concentration sulfate effluent treatment plant of integration.
Background
The high-concentration sulfate wastewater mainly comes from two types of industrial wastewater: firstly, mining waste water containing sulfate; the second is waste water discharged by fermentation, pharmacy and light industry. The concentration of sulfate contained in the wastewater exceeds 1000mg/L, even reaches 5000mg/L, and if the sulfate cannot be effectively removed, the biochemical treatment effect of the wastewater is influenced, and on the other hand, the sulfate discharged along with the wastewater has great influence on the environment, particularly causes land salinization.
The invention patent with the application number of CN201510027825.7 discloses a high-concentration sulfate-resistant efficient anaerobic reactor and a method for treating wastewater by using the same, the invention is a liquid internal circulation and gas external circulation combined desulfurization jet flow anaerobic reactor, and the wastewater treatment process comprises an efficient anaerobic reaction system and H2S removal system and return gas line system, separated H2S is oxidized into sulfur simple substance resource by complex iron for reuse, H is removed2The gas of S enters the reactor through a backflow gas pipe to promote H2S is removed, the treated wastewater is discharged out of the reactor through the effluent weir, the efficiency of anaerobic reaction is improved by using a stripping body of hydrogen sulfide through recycling methane gas, and resource recovery of elemental sulfur and methane gas is realized; however, in the implementation process of the invention, air aeration is adopted, so that air is easily introduced into the reactor, the effect of anaerobic reaction is influenced, and the treatment facility of the invention has large occupied area and more complex process flow.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the technical problem and providing an integrated vertical high-concentration sulfate wastewater treatment device with simple process flow and high treatment effect.
The utility model adopts the technical scheme as follows:
an integrated vertical high-concentration sulfate wastewater treatment device comprises a hydrolysis acidification reaction section for reducing sulfate radical in high-concentration sulfate wastewater, a hydrogen sulfide stripping section for reducing the concentration of hydrogen sulfide, a methanogenesis reaction section for removing organic matters in wastewater, and a tank body for accommodating the hydrolysis acidification reaction section, the hydrogen sulfide stripping section and the methanogenesis reaction section, wherein the hydrolysis acidification reaction section is arranged at the lower section of the tank body, which comprises a bottom water distribution pipe used for uniformly distributing high-concentration sulfate wastewater and a first packing layer used for providing a growth environment for sulfate reducing bacteria, wherein a hydrogen sulfide stripping section is arranged at the middle section of a tank body, which comprises a stripping pipeline and a gas collecting part, wherein the methane generating reaction section is arranged at the upper section of the tank body, the methane tank comprises a second filler layer for providing a growth environment for methanogens and a water outlet weir arranged along the circumference of the tank body.
In the prior art, the treatment method of high-concentration sulfate wastewater comprises a physical chemical method, an anaerobic biochemical method or a method combining physical chemistry and anaerobic biochemical methods. The physical and chemical method has large medicament dosage and high operation cost; an anaerobic biochemical method, wherein in a hydrolysis acidification stage, along with continuous reduction of sulfate in the high-concentration sulfate wastewater into hydrogen sulfide, the activity of methanogens in the anaerobic reactor can be inhibited after the hydrogen sulfide is generated and accumulated to a certain degree, and the degradation efficiency of organic matters in the high-concentration sulfate wastewater is reduced, so that the efficiency of the anaerobic reactor is influenced; in conclusion, the actual production mostly adopts the process of combining the anaerobic biochemical method and the physicochemical method, and mainly comprises the steps of anaerobic treatment, stripping by blowing, anaerobic treatment, dosing and precipitation and the like.
The utility model adopts the anaerobic and stripping process to treat the high-concentration sulfate wastewater. Research shows that the treatment facilities adopted in the anaerobic and stripping process in the prior art generally adopt sectional treatment, namely each treatment step needs to be provided with a corresponding treatment system, and simultaneously, a plurality of pipelines and equipment are involved, the process flow is more complex, and the whole treatment system occupies a larger area.
To sum up, the utility model provides an integration vertical processing apparatus closes anaerobism processing apparatus with blowing off as an organic whole to in order to obtain better anaerobic treatment effect, adopt inert gas to blow off the hydrogen sulfide gas that produces, three-dimensional follow supreme three part that divide into altogether including hydrolysis-acidification reaction section, hydrogen sulfide blows off the section and produces methane reaction section, only need with high concentration sulfate waste water pump go into can obtain in the processing apparatus get rid of the sulfate radical and get rid of most organic matter's result. Furthermore, the utility model discloses the device outer joint has the gaseous processing apparatus that takes off of blowing of nitrogen gas and hydrogen sulfide mist that the blowing is taken off, process the gaseous processing apparatus of blowing take off handle the hydrogen sulfide in the back mist and is detached, the nitrogen gas that purifies continues cyclic utilization.
Preferably, the tank body is a closed reaction tank made of carbon steel Q235 or stainless steel 304.
Preferably, the first packing layer is a combined biological packing, the first packing layer is provided with a packing support, the first packing layer is suspended on the packing support, the thickness of the first packing layer is 2-3 m, the first packing layer comprises a plurality of packing modules, and the distance between the packing modules is 150-200 mm.
Preferably, the air stripping pipeline is made of a carbon steel pipe, a stainless steel pipe or a UPVC pipe, and aeration holes with the diameter of 1-2 mm are formed in the air stripping pipeline.
Preferably, the stripping gas of the hydrogen sulfide stripping section is nitrogen, the ratio of the gas amount of the stripping gas to the wastewater treatment water amount is 6: 1-5: 1, and the stripping gas is blown by a blower and enters the stripping pipeline through an air inlet pipeline.
Preferably, the gas collection portion include upper strata gas collection cover group and lower floor's gas collection cover group, upper strata gas collection cover group and lower floor's gas collection cover intergroup overlap joint's length more than or equal to 300mm each other, upper strata gas collection cover group and lower floor's gas collection cover group respectively include a plurality of gas collection covers, the cover body inclination more than or equal to 55 of gas collection cover, the top of gas collection cover is equipped with the air duct.
Preferably, the second packing layer is a combined biological packing, the second packing layer is provided with a packing support, the second packing layer is suspended on the packing support, the thickness of the second packing layer is 2-3 m, the second packing layer comprises a plurality of packing modules, and the distance between the packing modules is 150-200 mm.
Preferably, the methane production reaction section is connected with the methane water seal tank through an air outlet pipe arranged at the top of the tank body, the bottom water distribution pipe is connected with a water inlet pump through a water inlet pipeline arranged at the bottom of the tank body, and the hydrogen sulfide stripping section is connected with a stripping gas treatment device through an air guide pipe.
Preferably, the stripping gas treatment device comprises a hydrogen sulfide water sealed tank and a lye washing tower for performing spray washing on the collected gas.
The utility model discloses the beneficial effect who produces includes:
(1) the utility model discloses vertical high concentration sulfate waste water treatment device of integration, will the processing apparatus divide into hydrolysis acidification reaction section, hydrogen sulfide blow off section and methane production reaction section from the bottom to the supreme, the utility model discloses divide into hydrolysis acidification reaction section and methane production reaction section anaerobic reaction to add between two sections and establish hydrogen sulfide blow off section, utilize inert gas to blow off the hydrogen sulfide that hydrolysis acidification reaction section produced, reduce free hydrogen sulfide concentration, weaken hydrogen sulfide and can cause the inhibitory action to methane production fungus, guaranteed the activity of methane production fungus, improved the treatment effect to high concentration sulfate waste water;
(2) the utility model adopts an integrated vertical structure design, and arranges the hydrolysis acidification reaction section, the hydrogen sulfide stripping section and the methane production reaction section in the same tank body, thereby reducing the occupied area of the equipment and simplifying the treatment process of high-concentration sulfate wastewater;
(3) the utility model discloses a blow off gas treatment device is to blowing off the gas that comes out, and hydrogen sulfide is handled with the mist of nitrogen gas promptly, and the nitrogen gas after having got rid of the hydrogen sulfide can continue to blow off, blows off the nitrogen gas that only needs to supply a small amount of losses in-process, has reduced the energy consumption, has practiced thrift manufacturing cost.
Drawings
FIG. 1 is a schematic view of an integrated vertical high-concentration sulfate wastewater treatment plant;
FIG. 2 is a schematic view of a stripping gas treatment apparatus;
wherein, 1 is a hydrolysis acidification reaction section, 11 is a bottom water distribution pipe, 12 is a first packing layer, 2 is a hydrogen sulfide stripping section, 21 is a stripping pipeline, 211 is an aeration hole, 22 is a gas collection part, 221 is a gas collection cover, 222 is a gas guide pipe, 3 is a methane production reaction section, 31 is a second packing layer, 32 is a water outlet weir, 33 is a gas outlet pipe, 4 is a tank body, 5 is an air blower, 6 is a gas inlet pipeline, 7 is a methane water seal tank, 8 water inlet pipelines, 9 is a water inlet pump, 10 is a stripping gas treatment device, 101 is a hydrogen sulfide water seal tank, 102 is an alkali washing tower, 1021 is an alkali storage pool, 1022 is a washing filler, 1023 is a spray pipe, 1024 is a top demister, 1025 is an alkali washing pump, 13 is a nitrogen gas storage tank, and 14 is a nitrogen generator.
Detailed Description
The invention is described in further detail below with reference to the drawings and specific examples.
As shown in fig. 1, an integrated vertical high-concentration sulfate wastewater treatment device comprises a hydrolysis acidification reaction section 1 for reducing sulfate radicals in high-concentration sulfate wastewater, a hydrogen sulfide stripping section 2 for reducing the concentration of hydrogen sulfide, a methane-producing reaction section 3 for removing organic matters in the wastewater, and a tank 4 for accommodating the hydrolysis acidification reaction section 1, the hydrogen sulfide stripping section 2, and the methane-producing reaction section 3, wherein the hydrolysis acidification reaction section 1 is arranged at the lower section of the tank 4 and comprises a bottom water distribution pipe 11 for uniformly distributing the high-concentration sulfate wastewater and a first packing layer 12 for providing a growth environment for sulfate reducing bacteria, the hydrogen sulfide stripping section 2 is arranged at the middle section of the tank 4 and comprises a stripping pipeline 21 and a gas collection part 22, and the methane-producing reaction section 3 is arranged at the upper section of the tank 4 and comprises a second packing layer 31 for providing a growth environment for methane-producing bacteria and an effluent arranged along the circumference of the tank 4 A weir 32.
The tank body 4 is a closed reaction tank made of carbon steel Q235 or stainless steel 304.
The first packing layer 12 is a combined biological packing, the first packing layer 12 is provided with a packing support, the first packing layer 12 is hung on the packing support, the thickness of the first packing layer 12 is 2-3 m, the first packing layer 12 comprises a plurality of packing modules, and the distance between the packing modules is 150-200 mm.
The air stripping pipeline 21 is made of a carbon steel pipe, a stainless steel pipe or a UPVC pipe, and aeration holes 211 with the diameter of 1-2 mm are formed in the air stripping pipeline.
The stripping gas of the hydrogen sulfide stripping section 2 is nitrogen, the ratio of the gas amount of the stripping gas to the wastewater treatment water amount is 6: 1-5: 1, and the stripping gas is blown by a blower 5 and enters the stripping pipeline 21 through an air inlet pipeline 6.
The second packing layer 31 is a combined biological packing, the second packing layer 31 is provided with a packing support, the second packing layer 31 is hung on the packing support, the thickness of the second packing layer 31 is 2-3 m, the second packing layer 31 comprises a plurality of packing modules, and the distance between the packing modules is 150-200 mm.
The methane production reaction section 3 is connected with the methane water seal tank 7 through an air outlet pipe 33 arranged at the top of the tank body 4, the bottom water distribution pipe 11 is connected with a water inlet pump 9 through an air inlet pipeline 8 arranged at the bottom of the tank body 4, and the hydrogen sulfide stripping section 2 is connected with a stripping gas treatment device 10 through an air guide pipe 222.
The stripping gas treatment device comprises a hydrogen sulfide water seal tank 101 and an alkali liquor washing tower 102 for spraying and washing collected gas.
FIG. 2 is a schematic view of a stripping gas treatment apparatus, and as shown in FIG. 2, the stripping gas treatment apparatus 10 comprises a hydrogen sulfide water-sealed tank 101 and a lye washing tower 102, wherein the hydrogen sulfide water-sealed tank 101 is used for ensuring that a certain pressure is maintained in a gas collection cover 221 to facilitate gas collection; the alkali liquor washing tower 102 is internally provided with an alkali liquor storage tank 1021, a washing filler 1022, a spray pipe 1023, a top demister 1024 and an alkali liquor washing pump 1025.
As shown in fig. 1 and 2, the flow of treating high-concentration sulfate wastewater by using the integrated vertical high-concentration sulfate wastewater treatment device is as follows:
(1) hydrolysis acidification reaction section: the high-concentration sulfate wastewater to be treated is pumped into a water inlet pipeline 8 through a water inlet pump 9 and flows into a water distribution pipe 11 arranged at the bottom of the hydrolysis acidification reaction section 1, the high-concentration sulfate wastewater is uniformly distributed on the cross section of the hydrolysis acidification reaction section 1, the wastewater slowly rises at a certain speed and reaches a first packing layer 12, and Sulfate Reducing Bacteria (SRB) attached and grown in the first packing layer 12 reduce sulfate radicals in the water into hydrogen sulfide gas.
(2) Hydrogen sulfide stripping section: the hydrogen sulfide gas generated by the reaction is dissolved in the wastewater, and if the hydrogen sulfide gas cannot be removed from the wastewater, the activity of the subsequent methanogen is seriously influenced, so that the anaerobic effect is influenced, and the hydrogen sulfide gas is blown off by adopting inert gas. The embodiment of the utility model provides an inert gas is nitrogen gas. The wastewater continuously and slowly rises to enter the hydrogen sulfide stripping section 2, a stripping pipeline 21 is arranged in the hydrogen sulfide stripping section 2, nitrogen generated by a nitrogen generator 14 enters a nitrogen gas storage tank 13 and is blown by an air blower 5, the nitrogen is finally sprayed out from an aeration hole 211 through an air inlet pipeline 6 to strip a mixture of the wastewater and the hydrogen sulfide, a mixed gas of the hydrogen sulfide and the nitrogen blown out is collected by a gas collection part 22 arranged at the top of the hydrogen sulfide stripping section 2, and the mixed gas enters a gas guide pipe 222 arranged at the top of a gas collection cover 221 and enters a stripping gas treatment device 10 for subsequent treatment.
The mixed gas of nitrogen and hydrogen sulfide enters the hydrogen sulfide water sealed tank 101 through the gas guide pipe 222, and the hydrogen sulfide water sealed tank 101 has the function of ensuring that a certain pressure is kept in the gas collecting cover, so that the gas is easy to collect. The mixed gas enters the alkali liquor washing tower 102 through a pipeline, alkali liquor is pumped out from an alkali liquor storage pool 1021 at the bottom of the washing tower 102 by an alkali liquor washing pump 1025 and is sprayed out by a spraying pipe 1023, the alkali liquor is uniformly sprayed from the top down, the mixed gas is in full contact with the washing filler 1022 from the bottom up, and hydrogen sulfide in the mixed gas is absorbed and removed by the alkali liquor. The remaining nitrogen is further dewatered by a top demister 1024 arranged at the top of the lye washing tower 102. The purified nitrogen gas obtained after the removal of water is sent to the blower 5 through a pipe, and is pressurized by the blower 5 and returned to the air intake pipe 6 again to be subjected to the blow-off treatment, and the process is repeated cyclically. The alkali liquor in the alkali liquor washing tower 102 needs to be replaced periodically to ensure that the pH value of the alkali liquor is not lower than 12. Meanwhile, the gas leaks to a certain extent in the continuous circulation process of stripping, collection, washing and stripping, and nitrogen is required to be supplemented in order to ensure a certain gas-water ratio. Therefore, the nitrogen generator 14 is required to be automatically operated all the time in the wastewater treatment process so as to automatically supplement nitrogen into the stripping pipeline when nitrogen needs to be supplemented.
The gas collecting part 22 comprises an upper layer gas collecting hood group and a lower layer gas collecting hood group, and the length of the mutual lap joint between the upper layer gas collecting hood group and the lower layer gas collecting hood group is more than 300mm, so that the blown-off hydrogen sulfide is ensured to be fully collected by the gas collecting hood 221 along with nitrogen, and meanwhile, the wastewater can cross the gas collecting part and continuously rise; the cover body inclination of the gas collection cover 221 is greater than or equal to 55 degrees, so that the activated sludge in the wastewater can smoothly slide down along the gas collection cover without being gathered on the surface of the gas collection cover.
(3) A methanogenesis reaction section: the waste water is subjected to stripping treatment in the hydrogen sulfide stripping section 2, wherein most of the free hydrogen sulfide is stripped, the concentration of the hydrogen sulfide in the waste water is reduced to a degree insufficient to inhibit methanogenic bacteria, and then the waste water slowly rises to cross the gas collection part 22 to reach the methanogenic reaction section 3. The methane-producing reaction section is provided with a second packing layer 31, methanogen is attached to and grows on the second packing layer 31, and the wastewater reaching the second packing layer 31 is subjected to anaerobic decomposition to remove organic matters by utilizing the characteristic that the methanogen needs to consume the organic matters in methane production. The generated methane is gathered at the top of the tank body 4 of the device, enters the methane water-sealed tank 7 through the air outlet pipe 33 arranged at the top of the tank body 4, and then undergoes the subsequent incineration or recovery treatment process. After organic matters are removed from the treated wastewater, the wastewater is discharged from the effluent weir 32 to continue the subsequent treatment process.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, but rather as the invention is intended to cover all modifications, equivalents and improvements falling within the spirit and principles of the present invention.
Claims (9)
1. Vertical high concentration sulfate effluent treatment plant of integration, its characterized in that: the device comprises a hydrolytic acidification reaction section (1) for reducing sulfate radicals in high-concentration sulfate wastewater, a hydrogen sulfide stripping section (2) for reducing the concentration of hydrogen sulfide, a methanogenesis reaction section (3) for removing organic matters in the wastewater and a tank (4) for accommodating the hydrolytic acidification reaction section (1), the hydrogen sulfide stripping section (2) and the methanogenesis reaction section (3), wherein the hydrolytic acidification reaction section (1) is arranged at the lower section of the tank (4) and comprises a bottom water distribution pipe (11) for uniformly distributing the high-concentration sulfate wastewater and a first packing layer (12) for providing a growth environment for sulfate reducing bacteria, the hydrogen sulfide stripping section (2) is arranged at the middle section of the tank (4) and comprises a stripping pipeline (21) and a gas collection part (22), and the methanogenesis reaction section (3) is arranged at the upper section of the tank (4), the methane tank comprises a second filler layer (31) for providing a growth environment for methanogens and a water outlet weir (32) arranged along the circumference of the tank body (4).
2. The integrated vertical high-concentration sulfate wastewater treatment device according to claim 1, characterized in that: the tank body (4) is a closed reaction tank made of carbon steel Q235 or stainless steel 304.
3. The integrated vertical high-concentration sulfate wastewater treatment device according to claim 1, characterized in that: the composite biological packing material is characterized in that the first packing layer (12) is a composite biological packing material, the first packing layer (12) is provided with a packing support, the first packing layer (12) is hung on the packing support, the thickness of the first packing layer (12) is 2-3 m, the first packing layer (12) comprises a plurality of packing modules, and the distance between the packing modules is 150-200 mm.
4. The integrated vertical high-concentration sulfate wastewater treatment device according to claim 1, characterized in that: the air stripping pipeline (21) is made of a carbon steel pipe, a stainless steel pipe or a UPVC pipe, and aeration holes (211) with the diameter of 1-2 mm are formed in the air stripping pipeline.
5. The integrated vertical high-concentration sulfate wastewater treatment device according to claim 1, characterized in that: the stripping gas of the hydrogen sulfide stripping section (2) is nitrogen, the ratio of the gas amount of the stripping gas to the wastewater treatment water amount is 6: 1-5: 1, and the stripping gas is blown by a blower (5) and enters the stripping pipeline (21) through an air inlet pipeline (6).
6. The integrated vertical high-concentration sulfate wastewater treatment device according to claim 1, characterized in that: gas collection portion (22) include upper gas collection cover group and lower floor's gas collection cover group, upper gas collection cover group and lower floor's gas collection cover intergroup overlap joint's length more than or equal to 300mm each other, upper gas collection cover group and lower floor's gas collection cover group are respectively including a plurality of gas collection covers (221), the cover body inclination more than or equal to 55 of gas collection cover (221)°And the top end of the gas collecting cover is provided with a gas guide pipe (222).
7. The integrated vertical high-concentration sulfate wastewater treatment device according to claim 1, characterized in that: the second packing layer (31) is a combined biological packing, the second packing layer (31) is provided with a packing support, the second packing layer (31) is hung on the packing support, the thickness of the second packing layer (31) is 2-3 m, the second packing layer (31) comprises a plurality of packing modules, and the distance between the packing modules is 150-200 mm.
8. The integrated vertical high-concentration sulfate wastewater treatment device according to claim 1, characterized in that: the methane production reaction section (3) is connected with the methane water seal tank (7) through an air outlet pipe (33) arranged at the top of the tank body (4), the bottom water distribution pipe (11) is connected with a water inlet pump (9) through an air inlet pipeline (8) arranged at the bottom of the tank body (4), and the hydrogen sulfide stripping section (2) is connected with a stripping gas treatment device (10) through an air guide pipe (222).
9. The integrated vertical high-concentration sulfate wastewater treatment device according to claim 8, characterized in that: the stripping gas treatment device comprises a hydrogen sulfide water sealed tank (101) and an alkali liquor washing tower (102) for spraying and washing collected gas.
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| CN202021363761.0U CN212581727U (en) | 2020-07-13 | 2020-07-13 | Integrated vertical high-concentration sulfate wastewater treatment device |
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| CN202021363761.0U CN212581727U (en) | 2020-07-13 | 2020-07-13 | Integrated vertical high-concentration sulfate wastewater treatment device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111689659A (en) * | 2020-07-13 | 2020-09-22 | 福建中盟环保科技有限公司 | Integrated vertical high-concentration sulfate wastewater treatment device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111689659A (en) * | 2020-07-13 | 2020-09-22 | 福建中盟环保科技有限公司 | Integrated vertical high-concentration sulfate wastewater treatment device |
| CN111689659B (en) * | 2020-07-13 | 2023-11-24 | 福建中盟环保有限公司 | Integrated vertical high-concentration sulfate wastewater treatment device |
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Address after: 350001 area a, 24 / F, building 4, area F, Fuzhou Software Park, No.89 software Avenue, Gulou District, Fuzhou City, Fujian Province Patentee after: Fujian ZhongMeng environmental protection Co.,Ltd. Address before: 350001 area a, 24 / F, building 4, area F, Fuzhou Software Park, No.89 software Avenue, Gulou District, Fuzhou City, Fujian Province Patentee before: Fujian ZhongMeng Environmental Protection Technology Co.,Ltd. |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: Integrated vertical high concentration sulfate wastewater treatment plant Effective date of registration: 20210625 Granted publication date: 20210223 Pledgee: Minhou sub branch of Xiamen Rural Commercial Bank Co.,Ltd. Pledgor: Fujian ZhongMeng environmental protection Co.,Ltd. Registration number: Y2021350000065 |
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